JP2015521502A5

JP2015521502A5 -

Info

Publication number: JP2015521502A5
Application number: JP2015518728A
Authority: JP
Filing date: 2013-06-27
Publication date: 2016-08-12
Anticipated expiration: 2033-06-27

Claims

A method of determining the accuracy of a pressure sensor in a respiratory device, the respiratory device comprising a flow generator comprising a motor configured to generate a pressurized flow of breathable gas ,
Measuring the pressure of the flow of breathable gas generated by the flow generator using the pressure sensor;
Determining the accuracy of the pressure sensor by a processor based on the measured pressure and the altitude of the respiratory device. A method for determining the accuracy of the pressure sensor in the respiratory device.

The method of claim 1, wherein the altitude of the respiratory device is entered by a user or measured by an altimeter of the respiratory device .

Wherein the processor is a high degree of the breathing device is calculated to determine the accuracy of the pressure sensor based on evaluation of said calculated altitude A method according to claim 1 or 2.

The processor includes: (a) a pressure measured by the pressure sensor; (b) (1) a measured flow rate of the breathable gas flow; and (b) (2) a measurement of the flow generator. 4. The method of claim 3 , wherein the altitude of the respiratory device is calculated as a function of one or both of the measured motor speeds.

The method of claim 4 , wherein the processor calculates an altitude of the breathing device as a function of a measured temperature of the breathable gas flow.

The processor calculates the altitude of the respiratory device when the flow generator to control the breathable gas at a constant predetermined flow rate or constant predetermined motor speed, any one of claims 3-5 The method described in 1.

The processor evaluates the calculated altitude by comparing the calculated altitude with a predetermined range of altitudes, the predetermined range of altitudes being between 0 and 9000 feet above sea level. The method according to any one of claims 4 to 6 , wherein the method is between or between 500 feet below sea level and 10,000 feet above sea level .

The processor considers the calculated altitude acceptable when the calculated altitude is within the altitude range of the predetermined range , and / or the calculated altitude is within the predetermined range. The method of claim 7 , wherein the calculated altitude is considered unacceptable when out of a range of altitudes .

The processor calculates the altitude of the respiratory device at a predetermined frequency for a predetermined period of time, the method according to any one of claims 3-8.

The method of claim 9 , wherein the processor evaluates the pressure sensor based on an average of the calculated altitudes.

11. The method of any one of claims 1 to 10 , wherein the processor evaluates the pressure sensor in an initialization process before the respiratory device provides treatment to a patient.

The processor is
Calculating the expected pressure of the gas produced by the breathing device;
Comparing the measured pressure with the expected pressure;
It allows to evaluate the accuracy of the pressure sensor, the method according to any one of claims 1 to 11.

The method of claim 12 , wherein the processor calculates the expected pressure from an altitude of the breathing device, a measured flow rate of the flow of breathable gas, and a measured motor speed of the flow generator. .

14. The method of claim 12 or 13 , wherein the processor determines the accuracy of the pressure sensor by comparing the difference between the measured pressure and the expected pressure with a predetermined threshold.

15. The measurement of any one of claims 12 to 14 , wherein the measurement of the pressure, the calculation of the expected pressure, and the comparison of the measured pressure with the expected pressure are performed at a predetermined frequency over a predetermined time period. The method according to item.

The method of claim 15 , wherein the processor determines that the pressure sensor is inaccurate based on multiple comparisons between the measured pressure and the expected pressure.

The altitude of the breathing device is a first altitude, and the processor
Calculating a second altitude of the breathing device;
By comparing with a high degree the second of the respiratory device advanced the first of the breathing device, the method according to the determined accuracy of the pressure sensor, any one of claims 1 to 11.

The method of claim 17 , wherein the processor calculates the second altitude at a predetermined frequency over a predetermined period.

19. A method according to any one of claims 9, 10, 15, 16 and 18, wherein the predetermined frequency is between 1 and 2 hertz.

19. A method according to any one of claims 9, 10, 15, 16 and 18 , wherein the predetermined period is 5 seconds.

When the processor is determined to be inaccurate the pressure sensor, further comprising the step of setting the motor speed for the flow generator based on the measured pressure, any one of claims 1 to 20 The method described in 1.

The method of claim 21 , further comprising maintaining the motor speed below a speed limit threshold.

Determining a desired gas pressure generated by the flow generator based on a predetermined association between a motor speed value and a pressure value; and determining a desired motor speed for the flow generator. The method according to any one of claims 1 to 22 , further comprising:

A breathing device,
A flow generator containing therein a blower that generates a breathable gas flow for a patient interface at a pressure above atmospheric pressure;
A pressure sensor coupled to the flow generator, the pressure sensor configured to measure a pressure of the breathable gas flow;
A processor coupled to the pressure sensor, the processor comprising: a processor configured to determine accuracy of the pressure sensor based on the measured pressure and the altitude of the respiratory apparatus.

(I) a flow sensor configured to measure a flow rate of the breathable gas flow ; (ii) a motor speed sensor configured to measure a motor speed of the flow generator; (iii) by a user. 25. The apparatus of claim 24 , further comprising at least one of a user I / O device configured to receive an input altitude of the respiratory apparatus, and (iv) an altimeter that determines the altitude of the respiratory apparatus . Breathing device.

26. A respiration according to any one of claims 24 to 25 , wherein the processor is configured to calculate an altitude of a respiratory device and determines the accuracy of the pressure sensor based on the calculated altitude assessment. apparatus.

The processor includes: (a) the pressure measured by the pressure sensor; (b) (1) the measured flow rate of the breathable gas flow; and (b) (2) the measured flow generator. 27. A respiratory apparatus according to claim 26 , configured to calculate an altitude of the respiratory apparatus as a function of one or both of motor speed.

28. A respiratory apparatus according to claim 27 , wherein the processor is configured to calculate an altitude of the respiratory apparatus as a function of a measured temperature of the breathable gas flow.

29. The processor of any of claims 26 to 28 , wherein the processor is configured to calculate the altitude of the breathing apparatus when the flow generator controls the gas to a constant predetermined flow rate or a constant predetermined motor speed. A respiratory apparatus according to claim 1.

30. A respiratory apparatus according to any one of claims 26 to 29 , wherein the processor is configured to evaluate the calculated altitude by comparing the calculated altitude with a predetermined range of altitudes.

The processor is configured to (i) accept the calculated altitude when the calculated altitude is within a range of altitudes of the predetermined range ; or (ii) the calculated altitude 31. A respiratory apparatus according to claim 30 , wherein the breathing apparatus is configured to make the calculated altitude unacceptable when the altitude is outside the altitude range of the predetermined range .

32. A respiratory apparatus according to any one of claims 26 to 31 , wherein the processor is configured to calculate the altitude of the respiratory apparatus at a predetermined frequency over a predetermined period of time.

34. The respiratory apparatus of claim 32 , wherein the processor is configured to evaluate the pressure sensor based on the calculated average altitude.

34. A respiratory apparatus according to claim 32 or 33 , wherein the processor is configured to determine that the pressure sensor is accurate when the calculated average altitude satisfies a threshold comparison.

35. A respiratory apparatus according to any one of claims 24 to 34 , wherein the processor is configured to evaluate the pressure sensor in an initialization process before the respiratory apparatus provides treatment to a patient.

36. The respiratory apparatus according to any one of claims 24 to 35 , further comprising a memory that stores an altitude of the respiratory apparatus.

The processor is
Calculating the expected pressure of the gas produced by the breathing device;
37. A respiratory apparatus according to any one of claims 24 to 36 , wherein the accuracy of the pressure sensor is evaluated by comparing the expected pressure with a pressure measured by the pressure sensor.

The processor is configured to calculate the expected pressure using an altitude of the breathing apparatus, a measured flow rate of the breathable gas flow, and a measured motor speed of the flow generator. Item 38. The respiratory apparatus according to item 37 .

39. The respiratory apparatus of claim 38 , wherein the processor is configured to calculate the expected pressure using a measured temperature of the breathable gas flow.

40. A breath according to any one of claims 37 to 39 , wherein the processor determines the accuracy of the pressure sensor by comparing a difference between the expected pressure and the measured pressure with a predetermined threshold. apparatus.

Wherein the predetermined threshold is 5 cmH ₂ O, respiratory apparatus of claim 40.

The processor (i) determines that the pressure sensor is inaccurate when the difference exceeds the predetermined threshold , or (ii) when the difference is within the predetermined threshold. 82. A respiratory apparatus according to any one of claims 80 to 81, wherein the pressure sensor is determined to be accurate .

Wherein the processor is at a predetermined frequency for a predetermined period of time, reading the measured value of the pressure from the pressure sensor, the expected pressure is calculated and constructed the expected pressure, as compared to the measured pressure The respiratory apparatus according to any one of claims 40 to 42 .

44. The respiratory apparatus of claim 43 , wherein the processor is configured to determine that the pressure sensor is inaccurate based on multiple comparisons between the measured pressure and the expected pressure.

The altitude of the respiratory device is a first altitude, and the processor
Calculating a second altitude of the respiratory device;
By comparing with a high degree the second of the respiratory device advanced the first of the respiratory device, configured for determining the accuracy of the pressure sensor, any one of claims 24-36 Respiratory device according to.

The processor calculates the second altitude of the breathing apparatus from the measured flow rate of the breathable gas flow, the measured motor speed of the flow generator, and the pressure measured by the pressure sensor. 46. A respiratory apparatus according to claim 45 , configured to :

47. The respiratory apparatus of claim 46 , wherein the processor is configured to calculate the second altitude of the respiratory apparatus from the measured temperature of the flow of breathable gas.

Wherein the processor, by comparing the difference between the first height and the second height which is the measurement with a predetermined threshold value, configured for determining the accuracy of the pressure sensor, according to claim 4 5 The respiratory apparatus according to any one of to 47 .

49. A respiratory apparatus according to claim 48 , wherein the predetermined threshold is 600 feet.

The processor is configured to determine that the pressure sensor is inaccurate when the difference exceeds the predetermined threshold and / or the pressure when the difference is within the predetermined threshold. 50. A respiratory apparatus according to claim 48 or 49 , wherein the sensor is determined to be accurate .

Wherein the processor is at a predetermined frequency for a predetermined period of time, reading the pressure measurements from the pressure sensor, configured to calculate the second altitude based on the measured values, according to claim 45-50 The respiratory apparatus of any one of Claims.

Wherein the processor is for determining the average of the second altitude to be calculated during the predetermined period of time is incorrect the pressure sensor at different altitude only the first larger offset than a predetermined threshold value 52. The respiratory apparatus of claim 51 , wherein the respiratory apparatus is configured.

Said pressure sensor, said to be calculated during a predetermined period the second high average is determined to be accurate at different only the first altitude greater offset than a predetermined threshold value, according to claim 51 or 52. A respiratory apparatus according to 52 .

54. A respiratory apparatus according to any one of claims 32-34, 43, 44, and 51-53, wherein the predetermined frequency is between 1 hertz and 2 hertz.

97. A respiratory apparatus according to claim 95 or 96, wherein the predetermined period is 5 seconds.

Wherein the processor, the processor is said further to set the flow generator configured to motor speed based on the pressure measured by the pressure sensor in determining the pressure sensor to be inaccurate, it claims 24 55. A respiratory apparatus according to any one of.

57. The respiratory apparatus of claim 56 , wherein the processor is further configured to maintain the motor speed below a speed limit threshold.

The processor further determines a desired gas pressure generated by the flow generator based on a predetermined association between the motor speed value and the pressure value, and further determines a desired motor speed for the flow generator. 58. A respiratory apparatus according to any one of claims 24 to 57 , which is configured.